Musannaf Ibn Abi Shaybah 39570 — The Battle of the Trench

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both): The Throne shook out of love for the meeting of Allah Almighty with Sa'd, that is, the bier. He said: "And he raised his parents upon the throne." The narrator says: The timbers of the bier came apart. The narrator says: The Messenger of Allah (peace and blessings be upon him) entered the grave of Sayyiduna Sa'd (may Allah be pleased with him) and he (peace and blessings be upon him) stayed there. Then when he (peace and blessings be upon him) came out, the people said: "O Messenger of Allah (peace and blessings be upon him)! What made you stay inside?" He (peace and blessings be upon him) said: "Sa'd was squeezed once in the grave, so I prayed to Allah that this state be removed."